| 摘要: |
| 研究了单细胞铜绿微囊藻和三种丝状蓝藻(水华束丝藻、水华鱼腥藻及土生席藻)间的相互作用,包括以下两个方面的内容:①铜绿微囊藻细胞滤出液对水华束丝藻、水华鱼腥藻及土生席藻生长的影响;②水华束丝藻、水华鱼腥藻及土生席藻细胞滤出液对铜绿微囊藻生长的影响.研究发现,当滤出液浓度为60%(滤出液与BG11的体积比为3:2)时,制绿微囊藻细胞滤出液对水华束丝藻、水华鱼腥藻的生长有显著促进效果,尤其对水华束丝藻的作用更加明屁;对土生席藻的生长却起着微弱的抑制作用,仅表现于100%细胞滤出液中,对铜绿微囊藻而言,土生席藻细胞滤出液对其的生长起着显著抑制作用,浓度越高、抑制作用越强;而水华束丝藻、水华鱼腥藻仅在100%细胞滤出液中才表现出微弱的抑制作用.为验证营养盐浓度差异是否影响滤出液的作用效果,进行了无机营养盐(NO3-N、NH4+-N、PO4-P)干扰的消除试验.结果表明,无机营养盐(NO3-N、NH4+-N、PO4-P)的改变并不影响滤出液的作用效果,从而我们推测水华蓝藻之间存在着化感作用.本研究为解释自然水体中藻类种群演替的原因,深入认识水华蓝藻的动力学机制提供了新的实验证据. |
| 关键词: 化感作用 铜绿微囊藻 水华束丝藻 水华鱼腥藻 土生席藻 |
| DOI：10.18307/2006.0208 |
| 分类号: |
| 基金项目:中国科学院知识创新工程重要方向性项目(KSCX2-1-10);国家重点基础研究发展规划项目(2002CB412306)资助 |
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| Allelopathic effect between Microcystis aeruginosa and three filamentous cyanobacteria |
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ZHANG Ting1,2, SONG Lirong1
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1.State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072,P. R. China;2.Graduate School of the Chinese Academy of Sciences, Beijing 100039, P. R. China
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| Abstract: |
| Allelopathy, the release of extracellular compounds that have an effect on the growth of other microorganisms, may be one factor contributing to formation and/or maintenance of cyanobacterial blooms. In this paper, the allelopathic effect between single-cell Microcystis aeruginosct and three filamentous cyanobacteria助hanizomerznn flos-uquae, Anabaena flos-aqtuae, Phormidium mucicolu was investigated. The experiment was conducted to find out the allelopathic effects of cell-free filtrate on the growth of different target organisms; 1.the cell-free filtrate of M.uPruginnsa on Aphunizomenorz flos-aquue, Arzubaerz.a fins-aquae and P. mucicola;2. the cell-free filtrate of Aphurztzomenon flos-uquae, Arzabuena flos-aquae and P. mucicola on M. aeruginosu. The results demonstrated that M.ueruginosu could accelerate the growth of Aphanizontenorz flo.s-rzquae and Anahrzerza flos-uquae, and slightly inhibited P. ntucicola. On the other hand, the growth of M, deruginostx was slightly suppressed by Aphurzizumenorz fins-aquue and.4rzabaena flo.s-aquae, but heavily inhibited by P. mucicolu. The inhibition by P. ntucicolu was enhanced with thf; increase of concentration of cell-free filtrate. Furthermore, the allelopathic effect between single-cell M. uerugino.su and three filamentons cyanobacteria.9phurzizurrzertnn flos-uquoe, Atwbaena floc-aquue, P. mucicolu was not influenced by the change of the concentration of inorganic nutrients in cell-free filtrates. It suggests that the inter-speties competition existed in cyanobacteria. The present study is implicated in illustrating dynamics of the cyanobacserial bloom. |
| Key words: Allelopathy Microcystis aeruginosa Aphanizomenon flos-aquae Anabaena flos-aquae Phormidium mucicola |
